to mill cards, potentially putting Darklord Spell/Traps in the GY for your High Level Darklords to copy
However if the inner sleeve somehow slides a little out of the outer sleeve, dirt and such can still get a grip on your card
If you arent certain about a card, you can always check the kerning and typeface of the card in question against that of the real cardlike the fake Igglybuff on the left and real Igglybuff on the right (fake Igglybuff credit: Redditor /u/Riezenberg)
This caused so much consternation that Wizards created the Reserve List, a selection of cards they would not reprint so they couldnt increase the supply of certain cards, making them extremely rare decades later
5C Avatar Aang Avatar Aang is my personal favorite Avatar-themed deck and this is the final version after multiple revisions and playtests
If a face-up Fusion Monster you control is destroyed by battle, or leaves the field because of an opponent's card effect, while this card is in your GY: You can target 1 Effect Monster your opponent controls